Insulator.



UVV NTOH 2 SHEETS-SHEET 1.

- PATENTED FEB. 25, 1908. J. D. E. DUNCAN.

INSULATOR APPLICATION FILAED SEPT. 9, 1907.

ATTORNEYS W/TNESS ES No. 880,203. PATENTED FEB. 25; 1908. J. D. E. DUNCAN. I

INSULATOR.

APPLICATION FILED SEPT. 9, 19 07.

' ZBJIBETS-BEEET 2.

, I my NITOH JOHN D. E. DUNCAN, OF BROOKLYN, NEW YORK.

INSULATOIR.

No. sso,2oe.

Specification of Letters Patent.

Patented Feb. 25, 1908.

Application filed September 9 1907. Serial No- 391.893-

T all whom it. may concern:

Be it known that 1, JOHN D. E. DUNCAN, a

citizen of the United States, and resident of the borough of Brooklyn, county of Kings,-

and State of New York, have invented a certain new and useful Improvement in lnsu-' lators, of which the followingis aspecification, taken in connection with the accompanying drawings.

This invention relates to insulators, and more particularly to high tension insulators suchas are required to carry currents of high voltage.

In the accompanying drawings showing illustrative embodiments of this invention, and in which the same reference numerals refer to similar parts in the several-figures, Figure 1 is a vertical section through one of the insulators,-showing portions of two other" insulators connected with it. Fig. 2 is a vertical section similar to Fig. 1 showing a slightly modified construction. Fig. 3 is a bottom view of Fig. 2 looking in the direction of the arrow. Fig. 4 is a detail plan view of the pressure ring shown in Fig. 2. Fig. 5 is a partial horizontal section on line 55 of Fig. 2 showing the slot through which the head of the bolt may be passed. Fig. 6 is a detailed sectional view, showing one form of arc ring. Fig. 7 is a vertical section of a modification. Fig. 8 is a side elevation, showing a plurality of my insulators supporting the cable. Fig. 9 is a detailed plan view on line 0c'y of Fig. 1. Fig. 10 is a detailed sectional view on line s-t of Fig. 1.

In the illustrative embodiments of the invention shown in the drawings, 1 is an insulator having a petticoat 3 and dome 2 which may be made of glass, porcelain or any other suitable insulating material; the diameter of the dome 2 is such as to fit snugly within the mouth 4 of the bell or body portion 5 of'the insulator 1. This bell or body portion may be formed of any suitable material, but i preferably form it of cast or malleable iron, and form an inwardly extending rib or flange 6 at or near its mouth 4; two vertically extendingarms 77 are secured to or cast on the top of the bell 5 between which is located the eye 80f a bolt 9, the bolt and eye being secured to the arms 77 by any suitable means such as a pin 10 which as shown in Fig. 1 passes through openings 1 1-1 l in the arm 7 7 and through the eye 8 of the bolt 9, securely looking one insulator to the bolt of the next, if a plurality of insulators are to be used.

lVithin the dome 2 I may locate the dome 12 of a smaller petticoat 13, the diameter or" this dome being just sufficient to pass through the throat 14 of the dome 2. I may, however, use only one petticoat and one dome or 1 may use a plurality of such petticoats nested one within the other and all supported by the body portion 5.- For purposes of illustration 1 show two such petticoats mounted or supported by each body portion 5, which 1 have found in practice to be ample, though my invention, as noted, is not limited to the number of petticoats, supported by each body portion 5. I

W hen two petticoats are used with each body portion Ii mount within the second petticoat 13, or if more than two are used then from the innermost one, a fastening means which as shown in Fig. 1 is a split bolt 9 having an eye 8 formed by bending the two arms 1616 of the bolt 9 upon themselves and to this eye 8 l secure anotherbodyportiontiif I desire to use a plurality of insulators, or if i only desire to use one insulator I secure a clamp 17'ior supporting the cable 18. (See Fig.8.) The ends 19-19 of the arms 1616 are preferably enlarged as shown in Figs. 1 and 9 for a purpose to be hereinafter described.

I assemble my insulator or nest and securely bind the parts together by taking the body portion 5 and placing within it a suitable quantity of binding material such as cement 20, and press the head 21 into the body portion 5 as far as possible. The dome 12 is mounted within the hollow dome 2 in exchamber 22, which is filled with cement 23,

when they spring outwardly, the cement'23 being forced between the arms 1t116 and locking the arms in the position shown in 'Fig. 1 as soon as the cement is set. That portion of the cement which is forced between the arms 1616 of course, resists the inward movement of the ends 1919 and thereby prevents the bolt 9 from being withdrawn from the petticoat 1.3, the enlarged ends 19-19 cooperating with the cement and the shoulders 26 to accomplish the same result.

Weight upon the bolt 15 is readily transmitted to the strengthening flange 6 upon the bell 5, the resultant strain being; indicated by lines AB and AC, this action 'being assisted by the beveled contour of the bolt ends 19; being understood, of course, that after the cement hardens, the strain is transmitted through it and through the respective shoulders 26, 51 and 25, 50 to the shoulder24 of the bell 5. The strain may be also transmitted by a pressure ring 32 shown in dotted lines in this figure, and in section in Fig. 2,

though it is to be understood that my invention is not limited to the use of such a pressure ring.

Instead of using the split bolt 9 with the arms 1616 I may use a solid bolt 27, Fig. 2, having a rectangular head 28, which is adapted to pass through the throat 29 of the small petticoat 30 and then be given a partial revolution to occupy the position shown indotted lines in Fig. 5, it being preferably locked in this position by any suitable means, such as cement 31. Or I may, (F ig. 7), use a solid bolt 52 having ahead 53 which is adapted to snugly pass through the throat 54 of the dome 12, the bolt being held in the recess 55 by any'suitable means such as cement 56. To further strengthen the insulator, I may use either with or with out cement, a split ressure ring 32, which is shown in detail in Big. 4, which may consist of four segments, the exterior surface of the ring being provided with a shoulder 33, which is adapted to cooperate with the shoulder 34 of the dome 2; in this form the shoulder is arranged at a sharper angle than in the form shown in Fig. 1.

By using one or a plurality of such insulators, as'shown in Fig. 8, for instance, the required surface to prevent leakage and penetration of the insulators may be obtained, dependent upon the voltage to be carried by the cable'18, it being understood of course, that with the hi her tension caused by the cable,more insuIators should be used. In Fig. 8 I have shown four such insulators but it is to be understood that one but it is understood that my invention is not limited to this construction, mount an arcing ring 35 which as shownin Fig. 3 is split, the ends 36-36 being bent at right angles to the body of the ring and an opening formed in them for the reception of a bolt 37, which by means of a nut 38 will tighten the arcing ring 35, upon the petticoat 3 in an obvious manner as shown in Figs. 2 and 3. To space this ring from the petticoat 3, I may cast or otherwise secure lugs 39 which will contact with the flared end of the petticoat 3. an arcing ring may be used alone as shown in Fig. 6, or in conjunction therewith, I may use arcing rods 40 which are secured to the ring by means of rivets 41 or in any other suitable manner. Such a ring alone or in conjunction with the rods will cause the leaking current if of suflicient tension to pass through them rather than to puncture the insulators: By using a suflicient number of my insulators, either one or more, the numher being determined by the voltage carried by the cable 18, I am enabled to resist and practically prevent the leaking of the current from the cable 18, to the support (not shown), from which my insulators are sus ended. Should, however, a current of big er voltage be sent through the cable 18,

than that which it is'nominallymeant to carry, instead of the excessive potential puncturing and ruining the insulators 1, it is permitted to leak over the insulator through the arcin ring 35 and arcing,rods 40, if such be used.

Such

Having thus described my invention inconnection with the several illustrative embodiments thereof, to the details of which it is not of course, to be limited, what is claimed asnew and what is desired to be secured by Letters Patent is set forth in the appended claims.

1. In insulators,a body portion having an I inclined internal supporting shoulder, a pet- ,ticoat having a dome withln said body portion, an internal petticoat having an inner dome located within the dome of said outer petticoat, a fastening bolt having a plurality of arms provided with inclined ends in the.

chamber Within said inner dome, there being cooperating inclined shoulders on said 1 I s a domes to cooperate with sa1d bolt ends and said supporting shoulder and cement locking.

the parts together and adapted to transmit strain angularly outward through said shoulders to said body portion.

2. In insulators, a body portion having an internal supporting shoulder, a petticoat having a dome within said body portion, an

inner petticoat having an inner dome within the dome of sa1d outer petticoat, fastemng means provided with an enlarged upper end in the chamber within said inner dome,'

there being cooperating inclinedshoulders arc away from the petticoat proper, I may,

on said domes to cooperate with the end of 2 id fastening means and said supporting shoulder and cement locking the parts together and adapted to transmit strain angulbarliy outward through said shoulders to said or y.

3. In insulators, a body ortion having an internal supporting shou der, a petticoat having a dome within said body portion, an inner petticoat having an inner dome within the dome of said outer petticoat, a fastening having a flaring end in the chamber within said inner dome, there being cooperating shoulders on said domes to cooperate with the end of said fastening and said supporting shoulder and cement locking the parts together and adapted to transmit strain out- Ward through said shoulders to said body portion.

4. In insulators, a'body portion, a petticoat having a dome supported within said body portion, said dome being provided with internal shoulders, 21; fastening having a plurality of members provided 'with enlarged portions in the chamber within said dome and cooperating with said shoulders, means to lie between the ends of said members to prevent the withdrawal of said fas tening from the insulator and binding material to secure the parts together and to transmit strain angularly outward through said shoulders. 1

5. In, insulators, a body portion, a petticoat having a dome within said body portion, an inner petticoat having an inner dome within the dome of said outer petticoat, a fastening bolt having a plurahty of arms provided with flaring portions in the chamber within said inner dome, there being inclined shoulders on said inner dome to cooperate with said flaring portions and binding material locking the parts together and adapted to transmit strain an ularly outward through said shoulder to said body portion.

6. In insulators, a body portion, a petticoat having a dome within said body portion, an inner petticoat having an inner dome within the dome of said outer petticoat, fastening means in the chamber within said in nor dome, there being inclined cooperating shoulders betweensaid domes, a pressure member between said inclined shoulders and binding material locking the parts together whereby strain is transmitted angularly outward through said shoulders to said body portion.

7 The combination of an insulator and an arcing ring.

- 8. The combination of an insulator and an arcing ring detachably connected to it.

9. The combination of an insulator, an arcing ring, and arcing rods. 1

10. The combination of a petticoat insulator having an arcing ring mounted upon it.

11. The combination with apetticoat insulator of a detachable arcing ring and areing rods mounted upon the ring.

, 12. In insulators, a body portion, a plurality of petticoats having nested domes within said body portion, a fastening bolt having a plurality of arms provided with flaring portions in the chamber within the inner dome,

there being inclined shoulders on said inner dome to cooperate with said flaring portions and binding material locking the parts in position and adapted to transmit strain angularly. outward through said shoulders to said body portion. 7

13.- In insulators, a body portion having body portion and having exterior and interior cooperatin shoulders, a second petticoat having a ome mounted Within the dome of the first petticoat, means mounted within the second petticoat for suspending a cable or another insulator, a ring adapted to cooperate with the shoulders of the respective petticoats to transmit the strain from one petticoat to the next, and cement adapted tolock the parts to ether and to also transmit the strain from t e suspending 'member within the innermost petticoat to the strengthening flange of the body portion.' 15. A hanging insulator comprising a body portion formed with a shoulder, one or more petticoats nested in the body portlon and aving cooperating shoulders to co-act with the shoulder on the body portion, means located between the shoulders to transmit the strain from one shoulder to the complementary shoulder and means secured to the petticoat, or if more than one be used to the central petticoat, to support a cable or another insulator.

. 16. In insulators, the combination of a body portion having a shoulder, a petticoat having a dome mounted within the body portion, said dome being provided upon its exterior andinterior with shoulders one of which is adapted to cooperate with the shoulder upon the body portion, another petticoat with a dome having exterior and interior shoulders mounted within the dome of the first petticoat, a fastening, one end of which is mounted within the dome of the innermost petticoat, and binding material adapted to perman'ently secure the members togethei' and to cooperate with the respective shoulders on the difierent members to trans-. lnit strain to the shoulder upon the body portion.

17. In insulators, the combination of a body portion having a shoulder, a pettiooat having a dome mounted within the body portion, said dome being provided upon its exterior and interior with shoulders cooperating with the shoulder upon the body portion, another petticoat with a dome having exterior and interior shoulders mounted within the dome of the first petticoat, a split bolt having its enlarged ends mounted within the innermost pettiooat, and binding material adapted to permanently secure the members together and to lie between the ends of the split bolt and prevent its removal from the insulator and to cooperate with the respective shoulders on the difierent members to transmit the strain upon the bolt to the shoulder upon the body portion.

18. In insulators, a body portion, a plurality of petticoats having nested domes within said body portion, there being cooperating shoulders on said domes, a pressure member interposed between said shoulders to transmit strain between the same and binding material looking the parts in position.

19. In insulators, a body portion, a plurality of petticoats having nested members within said body portion, there being cooperating shoulders on said members, and a pressure member interposed between said 35 shoulders to transmit strain.

20. In insulators, a body portion, a pettiooat having a dome supported within said body portion, a fastening having a flaring end in the chamber within said dome, there being inclined shoulders on said dome to co operatev with the end of said fastening, and binding material looking the parts together and adapted to transmit strain outward through said shoulders to said body portion.

21. In insulators, a body portion, a petticoat having a dome supported within said body portion, a fastening having an enlarged portion in the chamber within said dome, there being shoulders on said dome to cooperate with the enlarged portion of said fastening, and binding material locking the parts together and adapted to transmit strain angularly outward through said shoulders.

22. In insulators, a body portion, a petticoat having a dome supported within said body portion,'said dome being provided with internal shoulders, a split bolt having its enlarged ends mounted within the chamber in said dome to cooperate with said shoulders, and binding material to permanently secure the members together and-lie between the ends of the split bolt and prevent its removal from the insulator and to transmit strain angularly outward through said shoulders.

JOHN D. E. DUNCAN. 

